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26 April 2024 |
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The ROSAT Deep Survey IV. A distant lensing cluster of galaxies with a bright arc | | G. Hasinger
; R. Giacconi
; J.E. Gunn
; I. Lehmann
; M. Schmidt
; D.P. Schneider
; J. Truemper
; J. Wambsganss
; D. Woods
; G. Zamorani
; | | Date: |
21 Oct 1998 | | Subject: | astro-ph | | Affiliation: | Astrophysikalisches Institut Potsdam, European Southern Observatory, Princeton University Observatory, California Institute of Technology, Pennsylvania State University, MPI fuer extraterr. Physik, Osservatorio Astronomico Bologna | | Abstract: | An unusual double-lobed extended X-ray source (RX J105343+5735) is detected in the ROSAT ultra-deep HRI image of the Lockman Hole. The angular size of the source is 1.7 X 0.7 arcmin^2 and its X-ray flux is 2 X 10^-14 erg cm^-2 s^-1. R-band imaging from the Keck telescope revealed a marginal excess of galaxies brighter than R=24.5, but Keck LRIS spectroscopy of 24 objects around the X-ray centroid did not yield a significant number of concordant redshifts. The brightest galaxy close to the centre of the eastern emission peak appears to be a gravitationally lensed arc at z=2.570, suggesting that the X-ray object is associated with the lens, most likely a cluster of galaxies. Based on a comparison of lensing surface mass density, X-ray luminosity, morphology and galaxy magnitudes with clusters of known distance, we argue that RX J105343+5735 is a cluster at a redshift around 1. Future X-ray, ground-based optical/NIR and high resolution HST observations of the system will be able to clarify the nature of the object. | | Source: | arXiv, astro-ph/9810347 | | Services: | Forum | Review | PDF | Favorites | |
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